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The placentalia specific histone H3.4 promotes germ cell development and reproductive fitness

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE291274 | GEO | 2026/04/05

REPOSITORIES: GEO

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The eutherian-specific histone H3.4 promotes germ cell development and reproductive fitness

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The placentalia specific histone H3.4 promotes germ cell development and reproductive fitness [RNA-seq]

Project description:Genes involved in chromatin remodeling during sperm development are under strong evolutionary pressure to optimize reproductive fitness In mice, the histone H3.4 variant, encoded by the single copy H3f4 gene, is essential for spermatogenesis. H3.4 is highly expressed in spermatogonia and replaces progressively canonical H3 histones during spermatogonial expansion and differentiation. Phylogenetic analysis shows that H3f4 is specific to the placental lineage and originates from an ancestral H3.2 gene existing prior to the divergence of placental and marsupial mammals over 100 million years ago. Situated in a majorly truncated histone cluster, placental H3f4 orthologs show increased synonymous and non-synonymous substitution rates compared to analogous marsupial H3.2 genes. H3f4 carries four non-synonymous substitutions relative to H3.2 genes. To understand the impact of evolutionary sequence divergence on reproductive fitness, we reverted three of four non-synonymously substituted residues in H3f4 to those present in H3.1 (H3f4V24A, H3f4H42R, H3f4S98A) while leaving H3f4C96 intact which is identical to H3.1C96. When expressed from both alleles, neither single nor triple reversion of diverged residues affected spermatogenesis much. In contrast, hemizygous expression of the triply reverted H3f4H3.1 allele on a H3f4-deficiency background caused an >40% reduction in testis weight associated with death of pachytene spermatocytes, impaired differentiation of spermatids and aberrant expression of thousands of genes during spermatid elongation. Hemizygous expression of individual residue substitution alleles revealed that residues V24 and H42 of H3.4 promote spermatogenesis, while residue S98 is neutral. Together, our study shows that H3f4 has been subject to positive evolutionary selection, promoting male reproductive fitness.

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The placentalia specific histone H3.4 promotes germ cell development and reproductive fitness [ChIP-seq]

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The placentalia specific histone H3.4 promotes germ cell development and reproductive fitness

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Project description:The placentalia specific histone H3.4 promotes germ cell development and reproductive fitness [RNA-seq]

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